Which statement accurately describes an enzyme? An enzyme is used only once and increases the rate of a chemical reaction by raising the activation energy.
O An enzyme is used only once and increases the rate of a chemical reaction by lowering the activation energy.
An enzyme is reusable and increases the rate of a chemical reaction by raising the activation energy.
An enzyme is reusable and increases the rate of a chemical reaction by lowering the activation energy.

An enzyme is reusable and increases the rate of a chemical reaction by lowering the activation energy.

Explanation:

because enzymes are never destroyed they are used again and again

and lowering the activation energy increases the speed or rate of the chemical reaction

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

every el niño cycle is different. every year.